When was your last period?
There are many choices for pill initiation. What the pharmacist at pharmacy has told is one such method. It is called quick start method. You can start taking pills on any day of the cycle as long as you are sure that there are no chances for pregnancy
. But with this method you should use back up contraception
like condom for diaphragm for the first seven days.
Please note that with this method your mensus will be delayed until you complete active pills in the pack.
pills on the first day of cycle is another choice of starting the pill. First day of cycle means first day of normal menstrual flow.
When you start taking contraceptive pill on the first or second day of cycle there is no need to use back up contraception.
I hope I have answered to your satisfaction.